Finding the Fourth Proportional to 78,686.72, 108,587.72 and 42,876.72

Step by Step Solution

1. Step 1: Write the proportion equation
   78,686.72 : 108,587.72 = 42,876.72 : x
2. Step 2: Convert to fraction form
   78,686.72/108,587.72 = 42,876.72/x
3. Step 3: Cross multiply
   78,686.72x = 108,587.72 × 42,876.72
4. Step 4: Simplify right side
   78,686.72x = 4,655,885,373.07
5. Step 5: Solve for x
   x = 4,655,885,373.07/78,686.72
6. Step 6: Final answer
   x = 59,169.90